A hollow fiber microfiltration (MF) membrane is provided. The casting solution used to make this membrane includes a fiber-forming polymer having a degree of polymerization greater than about 1000, a water-soluble polymer, an anhydride with about 2 to 12 carbon atoms, and a solvent. The membrane is formed by mixing and heating these components to form a viscous dope and then extruding the dope through an annular orifice to form a hollow fiber MF membrane. The hollow fiber membrane is then fed through a coagulation bath and two leaching baths. The membrane is especially useful for filtering liquids, such as wine and juice, so as to remove bacteria, gel, and solid particles from the liquids.

Title
Hollow fiber microfiltration membranes and a method of making these membranes
Application Number
10/058983
Publication Number
20030141251
Application Date
January 28, 2002
Publication Date
July 31, 2003
Inventor
David H Koch
New York
NY, US
David McKinley
Melrose
MA, US
David Stead
Lowell
MA, US
Mahesh Mehta
Needham
MA, US
Edward M Schulz
Acton
MA, US
Candeloro DiCecca
Somerville
MA, US
Jiang Ji
Andover
MA, US
Agent
Stinson Morrison Hecker
MO, US
Assignee
Koch Membrane Systems
IPC
B01D 63/02
D01F 06/00
View Original Source